Blast-furnace.



No. 700,549. Pa-tent d May 20, 1902.

F. c. uoncnoss & .1. MITCHELL.

BLAST FURNACE.

(Application filed Feb. 15, 1902.

(N0 Model.)

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UNITED STATES PATENT; OFFICE.

FRANK c. 'NoRcRoss AND JAMES MITCHELL, oF LORAIN, OHIO.

' BLAsT-FuRNAc E;

SPECIFICATION formifig part f Letters Patent No. 700,549; eed May 20, 1902; Applicetion fi1ec1Ilelartiry ;i5,19 0. Serial No. 94,3355; mantis.)

To all whom it may conicej'mj Be it knownthatzwe, FRANKQ'NQROROSS and J AMESEAMITOHELL, citizens of the United States of America, and residents of Lorain,

ucts.

The invention consists'in the introduction of the dust into thefurnace at p'ointsbetween the hearth and the stock-line in the upper part of the furnace by meansof pipesin the sides and through the Walls of ""the'furnace or in connection with the blowpipes. The dust is to be forcibly injected by any suitable; means, as with a blower, steam, or electric I power.

In the accompanying drawingwhieh illus-;

trates' our invention, the figure isa vertical section of a blast-furnace.

Arepresents a smelting-furnace, which may be of any of the well-known forms and construction. Y a I a I B B are the air-blast blowpipe-nozzles and twyers. b bare nipples onsaidflblowpipes for the attachment of r dus't pipes for the introduction of dust in conj auction .with the air-blasts. V i p O C are pipes fixed nace in such numbers and'local-i-tiesas may be required between IIthe: stock -line and I hearth.

D is a dust-catchingpipe connectedwith the pipes O O. i n p v E is a blower connected by branches F F with the pipe D opposite tojthe connections withthe pipes C ;O.--' In said branches are;

The dust, which ,s nowusually caught in a dust-catcher, maybe'conveyed to the pipes v.

B B and O O and forcibly injected through them into the furnace-By this meansit is I l found that the dustcan be quickly and safely 1i put into the furnace, where-it is instantly provided cocks Gr G,'by means of which the that any one or more ofthe mingled with tlieicontentS,Iand thus avoid i the liability anddanger of being returned to the dust-catcher 'by sli'pping; of stock or ex Q plosion;

day of February, 1902. a.

Having described-ourinvention,' what we claim is-' ,f f V 11 ;In:eombination with ablast-furnace, a dust lcgllel ing ipipd a' series of injecting-pipes in- 2 fserted through the-walls ofthefurnac e, at in-' tervals: fro1n-:; top5tobottom, and connected in transversely withsaiddust pipm'and means, I substantially as described, connected to said u injection-pipes for forcibly injecting the dust t. 3 into the furnace, substantiallyas and fo'rithe purpose set forth; 1 Signed by us atOleve1and, Ohio;;thisllth 

